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I've been using Firefox Quantum since beta 3 in September and I must say, I'm impressed. It feels much snappier than the old Firefox, and much more stable. I only had it freeze once, in the early beta stages. Some add-ons I use weren't compatible at first, but it seems like many are slowly being updated for the new version. I wish I could use it on my XP laptop!
RAM usage with 8 tabs open is 304MiB, about half of what it was with the old versions. I think we finally have a good browser again!